35 lines
775 B
Go
35 lines
775 B
Go
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package missinggo
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import (
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"fmt"
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"reflect"
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)
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// Copy elements from src to dst. Panics if the length of src and dst are
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// different.
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func CopyExact(dest interface{}, src interface{}) {
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dV := reflect.ValueOf(dest)
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sV := reflect.ValueOf(src)
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if dV.Kind() == reflect.Ptr {
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dV = dV.Elem()
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}
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if dV.Kind() == reflect.Array && !dV.CanAddr() {
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panic(fmt.Sprintf("dest not addressable: %T", dest))
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}
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if sV.Kind() == reflect.Ptr {
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sV = sV.Elem()
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}
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if sV.Kind() == reflect.String {
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sV = sV.Convert(reflect.SliceOf(dV.Type().Elem()))
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}
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if !sV.IsValid() {
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panic("invalid source, probably nil")
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}
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if dV.Len() != sV.Len() {
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panic(fmt.Sprintf("dest len (%d) != src len (%d)", dV.Len(), sV.Len()))
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}
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if dV.Len() != reflect.Copy(dV, sV) {
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panic("dammit")
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}
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}
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